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```python
# AI Dev Tool: FastAPI Pydantic v2 Micro-SaaS Boilerplate
# Description: Production-ready FastAPI boilerplate with Pydantic v2 and PostgreSQL Vector Search Extension

from fastapi import FastAPI, HTTPException
from fastapi.responses import JSONResponse
from pydantic import BaseModel, Field
from typing import Optional, List
import psycopg2
from psycopg2 import Error
from psycopg2.extras import DictCursor

# Initialize FastAPI app
app = FastAPI(title="FastAPI Pydantic v2 Micro-SaaS Boilerplate", description="Production-ready FastAPI boilerplate with Pydantic v2 and PostgreSQL Vector Search Extension", version="1.0.0")

# Define Pydantic models
class User(BaseModel):
    """User model"""
    id: int = Field(..., description="User ID")
    name: str = Field(..., description="User name")
    email: str = Field(..., description="User email")

class Item(BaseModel):
    """Item model"""
    id: int = Field(..., description="Item ID")
    name: str = Field(..., description="Item name")
    description: Optional[str] = Field(None, description="Item description")

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